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A369003
Numbers k for which k' / gcd(k,k') is odd, where k' stands for the arithmetic derivative of k, A003415.
11
2, 3, 4, 5, 6, 7, 8, 10, 11, 13, 14, 17, 18, 19, 22, 23, 24, 26, 27, 29, 30, 31, 32, 34, 36, 37, 38, 40, 41, 42, 43, 45, 46, 47, 48, 50, 53, 54, 56, 58, 59, 60, 61, 62, 63, 64, 66, 67, 70, 71, 72, 73, 74, 75, 78, 79, 80, 82, 83, 84, 86, 88, 89, 90, 94, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 109
OFFSET
1,1
COMMENTS
Numbers k such that A276085(k) is not a multiple of four. - Antti Karttunen, Nov 11 2024
LINKS
PROG
(PARI) isA369003(n) = !A369001(n); \\ See the code in A369001.
CROSSREFS
Positions of odd terms in A083345, A373377 and in A373485. Positions of 0's in A369001.
Cf. A003415, A276085, A369002 (complement), A377874 (characteristic function).
Subsequences: A369007, (A377869 U A377875).
Cf. also A368999.
Sequence in context: A058363 A049810 A132018 * A377869 A334142 A044919
KEYWORD
nonn
AUTHOR
Antti Karttunen, Jan 14 2024
STATUS
approved